fix(LDAP): inlcude ldapExpertUsernameAttr in general attribute list

fixes corner cases in which an LDAP record might be loaded and used,
where the user is still not mapped - and then this information is
missing though expected.

Signed-off-by: Arthur Schiwon <blizzz@arthur-schiwon.de>

Author: blizzz

apps/user_ldap/lib/User/Manager.php

@@ -109,6 +109,7 @@ public function getAttributes($minimal = false) {
 		$baseAttributes = array_merge(Access::UUID_ATTRIBUTES, ['dn', 'uid', 'samaccountname', 'memberof']);
 		$attributes = [
 			$this->access->getConnection()->ldapExpertUUIDUserAttr,
+			$this->access->getConnection()->ldapExpertUsernameAttr,
 			$this->access->getConnection()->ldapQuotaAttribute,
 			$this->access->getConnection()->ldapEmailAttribute,
 			$this->access->getConnection()->ldapUserDisplayName,